Electrically-heated tool.



H. HERTZBERG & M. J. WOHL. ELEGTRICALLY HEATED TOOL.

APPLICATION IILED HOT. 14, 1907.

Patented Apr. 20, 1909.

JIM/EN was WITNESSES I UNITED STATES PATENT OFFICE.

HARRY HERTZBERG AND MAURICE J. WOHL, OF NEW YORK, N. Y., ASSIGNORS TO ECONOMY ELECTRIC COMPANY, OF BROOKLYN, NEW YORK, A CORPORATION OF NEW YORK.

ELECTRICALLY-IIEATED TOOL.

Application filed November 14, 1907.

To all whom it may concem:

Be it known that we, HARRY HERTZBERG and MAURICE J. l/VOHL, citizens of the United States, residing in the city of New York, borough of Brooklyn, county of Kings, and State of New York, and in the city of New York, borough of Manhattan, county and State of New York, respectively, have invented certain new and useful Electrically-Heated Tools, of which the following is a specification.

This invention is an electrically heated tool, the same appertaining more particularly to sad irons for domestic and laundry purposes, although certain features of the invention may be used in electrically heated tools for other purposes.

One part of the invention embodies means for holding an electrical heater into close mechanical engagement with a mass of metal, it being preferred to construct said retaining means in a way to secure ventilation of the device.

Another part of the invention contemplates means for connecting the tool, such as a sad iron, both mechanically and electrically in a circuit, said means being capable of operation easily and quickly for disconnecting the tool from the line, whereby the use of binding posts, cut out switches and other accessories is obviated.

Another part of the invention is a detachable handle for an electrically heated sad iron.

In the accompanying drawings, we have illustrated one practical embodiment of the invention, but the construction shown therein is to be understood illustrative, only, and not as defining the limits of the invention.

Figure 1 is a vertical longitudinal section of a sad iron embodying the present inven-.-

tion, the plane of the section being indicated by the dotted line 11 of Fig. 2. Fig. 2- is a horizontal section partly in plan, the plane of the section being indicated by the dotted line 22 of Fig. 1. Fig. 3 is a vertical cross section on the line 33 of i, the detachable handle being omitted.

In the example of the invention shown in the drawings, A, designates a metallic mass of such form as to serve the purposes of a body for a sad iron. Said body is provided with a longitudinal chamber, a, one end of Specification of Letters Patent.

Patented April 20, 1909.

Serial No. 402,156.

which opens through the rear portion or heel of the iron, as shown in Figs. 1 and 2. Said chamber is closed at the point, sides, top and bottom, and as represented in Figs. 1 and 3 the bottom of the chamber is formed by a member, b, which is integral with the body, A, at the point and sides of the iron, although said bottom member may be made in a separate piece and of a different metal from the body, A.

The upper wall of the chamber, a, and the upper face of the bottom, 6, are, preferably, parallel to each other, and in this chamber, a, are arranged the electrically operated heating unit, and the retaining means for said heating unit. The heating unit may be variously constructed, and it may be provided with different kinds of electrical resistances, but in the example shown, the heating unit is provided with a resistance coil composed of a metallic wire or ribbon B. Said wire or ribbon is wound on a core, 0, composed, preferably, of a flat piece of mica, see Figs. 1 and 3. The resistance coil is a fiat winding, the width of which is approximately the same as that of the cham her, a. Said resistance coil is arranged within said chamber so as to rest, practically, upon the bottom, 6, but the resistance coil is insulated from electrical contact with said bottom, .7), by an interposed layer of insulating material, (Z, the latter engaging directly with the upper face of the bottom, I). One end of the resistance coil is doubled back over the coil so as to produce a return lead, Z), and this return lead is insulated electrically from the winding of the coil, B, by another layer, 6, of insulating material.

It is desirable to retain the electrical resistance into close contact with the bottom, 2), of the metallic mass, and in securing this function we employ wedging means, the latter serving, also, to provide certain pas sages for the circulation of air in order to ventilate the chamber, a, of the metallic mass. The retaining means consists of a clamping plate C, having a wedge member,

C, and a cooperating wedge, D. The plate,

with the resistance coil and the return lead,

cl, thereof, by an interposed layer, 7, of insulating material. The plate, C, is pro vided on its upper side with a centrally disposed projection, C, said projection being integral with the plate and having a tapering or inclined upper face, thereby producing a wedge member. Said projection is considerably narrower than the plate, C, and, as stated, it occupies, preferably, a central position thereon, see Fig. 2. The member, D, is in the form of a long tapering piece of metal, thus resembling a key. This member, D, is considerably narrower than the plate, C, and preferably it is narrower than the wedge shaped projection O.

In assembling the heater and its retaining means, the insulating layer, (Z, is first placed on the bottom, 6, within the chamber, a. The resistance coil, B, and its core 0, are next placed on the layer, (Z, the layers, 6, f, being properly placed upon the, resistance coil and its return lead b, respectively. The plate, 0, is now adjusted into position in the chamber, said plate resting on the layer, f. The key or member, D, is now inserted, the. inclined face of said key engaging with the projection, C, while the straight top face of the key contacts with the horizontal upper wall of the chamber, a. The key or member, D, is forced into position in order to cooperate with the projection, C, whereby the plate, 0, is forcibly pressed toward the resistance coil, B, thus firmly clamping said resistance coil between the plate, 0, and the bottom, 6.

It is to be noted that the chamber, a, is open at one end, and further, that the pro 'jection, C, and the key, D, are disposed in the middle portion of said chamber, thus leaving comparatively wide spaces or compartments at the sides of the projection, C, and the key, D. The air is free to circulate in said spaces of the chamber, a, and the metallic mass, A, is thus effectually venti lated in order to dissipate the heat which is absorbed by the clamping member or plate, C, from the resistance coil, B. Furthermore, it is to be noted thatthe resistance coil, B, is held into closed mechanical engagement with the bottom, 6, for the purpose of transmitting directly to said bottom, the heat which is developed in the resistance coil, by the passage of an electric current therethrough. It is preferred to employ V mica as the electrical insulating material for the core, 0, of the coil, B, and the several layers, cl, 6, 7, for the reason that this particular material is a good electrical insulator.

and offers practically no resistance to the transmission of heat from the electrical resistance to the metallic parts of the tool.

E designates a closure which is applied to the rear end or heel of the metallic body, A, said closure being secured removably in place by suitable fastenings, such as screws, 6. The closure is provided with an upstanding neck portion, g, and with a longitudinal passage, 9. The neck of such closure extends, preferably, above the top face of the metallic body, A, and said neck is hollow, whereby the neck is adapted to serve as a socket for one member, F, of a two part connection, another member of said connection being indicated by G, in Fig. l. Said members, F, G, are composed, preferably, of porcelain, or other electrical in sulating material, and each member, F, G, is split or divided longitudinally, see Fig. 2. The member, F, is secured in the neck, 9, of

the closure, E, for the upper face of said member to be substantially flush with the edge of the neck, 9. Said member F, is provided with posts, h, from which extend conductors, 72/, which lead to the resistance coil, B, and its return wire, b, respectively, see Fig. 1. The other member, G, of the coupling is provided with internal metallic sleeves, 2', adapted to be slipped over the posts, 71, when the member, G, is moved into engagement with the member, F, whereby the posts serve to mechanically connect the members, F, G, and, also, to electrically connect the resistance coil into circuit with an external working circuit or line.

The member, G, is provided with a chamber, j, in which is held the knotted portion, 7', of a connecting cord, J, whereby the chamber, j, serves as an anchorage for the cord, J, in the member, G. As shown in Fig. 1, the cord, J, is precluded from chaf ing on the edges of the member, G, by a flexible metallic bushing 7c, and, furthermore, the cord, J, is provided with a plug J whereby it may be .connected with the working circuit or line.

The metallic body, A, is provided in its upper side with a recess, m, the latter being spanned by a cross bar, 0. The handle, M, is provided with a base portion, 4%, adapted to rest on the body, A, and to extend across the chamber, m, therein. Said base, a, is provided with a hook, p, the latter being adapted to extend into the recess or chamber, m, and to fit around the cross bar, 0. lVith this cross bar is adapted to engage a suitable catch, 0, which is supported on the base portion, n, of the handle, whereby the hook, p, and the catch, 0, are adapted to fasten the handle securely, but detachably, to the iron, A, and its cross bar, 0.

Having thus fully described the invention, what we claim as new, and desire to secure by Letters Patent is:

1. In an electrically heated tool, a chambered metallic mass, an electrical resistance in said chamber, a clamping member the width of which is equal substantially to that of the resistance, and a narrow key cooperating with the clamping member, whereby spaces are provided for the circulation of air in the chamber of said metallic mass.

2. In an electrically heated tool, an electrical resistance, a clamping member cooperating with said resistance, said member having a projection positioned centrally thereon, and a key in wedging engagement with said projection of the clamping member, the width of the key being less than that of said member.

3. In an electrically heated tool, an electrical resistance, a clamping member provided with a projection, and a key engaging with said projection.

&. In an electrically heated tool, an electrical resistance, a clamping member cooperating therew and a single wedge cooperating with said clamping member, the width of said wedge being than that of said clan'iping men'iber.

5. In an electrically heated tool, a chambered metallic mass, an electrical resistance therein, a member for clamping said resistance in position, the width of the member being equal substantially to that of the resistance, and a single wedge cooperating with said member, said wedge being of less width than the member.

6. In an electrically heated tool, a chambered metallic mass, an electrical resistance therein, a member for clamping said resistance into mechanical engagement with said mass, said member having a centrally positioned projection, and a wedge cooperating with said projection of the member and disposed in the chamber so as to produce therein spaces for the ventilation of said chamber.

7. In an electrically heated tool, a chambered metallic body, an electrical resistance therein, and retaining means for said resistance, said retaining means comprising a clamping plate and a narrow wedge so positioned in the chamber as to secure a circulation of air therein, whereby the chamber is ventilated.

8. In an electrically heated tool, a chambered metallic body, an electrical resistance therein, a clamping member having an inclined face, and a wedge shaped key cooperating with said inclined face, the width of the key being less than the width 0'! the chamber.

9. In an electrically heated tool, a chambered body provided with an open end, a plate secured to said body for closing the open end thereof, said plate having a socket, electrically operated heating means within the chamber of said body, a coupling member secured in said socket of the aforesaid member and electrically connected with said heating means, and another coupling member positioned externally with respect to said body, the second named coupling member being connected detachably to the first named coupling member.

10. In an electrically heated tool, a chambered body open at one end thereof, a plate secured to said body for closing said open end, said plate having an upwardly extending socket positioned beyond said body, electrically-operated heating means within said body, a coupling member secured in said socket and connected normally with said heating means, another couplin member positioned externally with respect to the socket, and means cooperating with said coupling members for mechanically and electrically uniting them.

in testimony whereot' we have signed our names to this specification in the presence of two subscribing witnesses.

HARRY HERTZBERG.

. MAURICE J. lVOI-IL.

itnesses h'lARGARET C. Pownnn, H. I. BERNHARD. 

